I have swapped 84 BII to 86 ranger and it fit. I was worried that the 86 transmission, which had the electric transfer case, would not have the threaded holes for the other transfer case shifter. But after I scraped all the grim off and dug out the holes, they were there, even though it had a electric transfer case on it. It all bolted right up.
I would get a new gasket that goes inbetween the trans and the transfer case. I used just silicone instead, and have had a minor oil leak every since that I need to fix. I think if I would have waited for the silicone to setup a little bit first, I would not have had the problem. Or just used a gasket.